Configuring and Monitoring LAN Network Manager (LNM)
This document describes the LAN Network Manager (LNM). It includes the following sections:
About LNM
Configuring LNM
LNM Commands
About LNM
LNM lets you manage Token Ring networks interconnected by source route bridges. It lets you monitor the operation of rings, bridges and individual ring stations.
Information collected by software agents on the bridge is available to LNM management stations. More specifically, LNM agents forward collected information via another agent called the LAN Reporting Mechanism (LRM), a proprietary IBM protocol. Information forwarding is done via an LLC2 connection to a LAN Network Manager station.
LNM Agents and Functions
The LNM agents and their functions include the following:
Figure 1 illustrates the connection between the bridge, LNM agents, and the IBM LNM station.
Figure 1 LNM Station and Agents
The following sections describe each LNM agent in more detail.
Configuration Report Server
At the request of LNM, CRS obtains and forwards ring station status to LNM. You can also use CRS to set ring station parameters and remove a station from the ring.
Configuration information generated by ring stations is forwarded to LNM. When LNM requests the status of a ring station, CRS builds and sends MAC frames to the station to obtain the information. CRS then sends the following to the ring station:
When the ring station replies, CRS puts the information into a properly formatted LLC2 frame and forwards it to LNM.
CRS can also remove a ring station from the ring at the request of LNM. To remove a ring station, CRS sends a Remove Station MAC frame to the ring. CRS also returns a response to LNM indicating the success or failure of the removal.
When CRS receives a Report New Active Monitor MAC frame, it forwards the information to LNM. When a Report NAUN (Next Active Upstream Neighbor) Change MAC frame is received, this information is also reported. The CRS agent has its own functional address that ring station MAC layers can use to forward MAC frames to CRS.
Ring Parameter Server
RPS inserts ring stations onto the ring. When a ring station is newly inserted into the ring the following occurs:
The RPS function has an associated functional address for receiving the MAC frames that other ring stations send to it.
Ring Error Monitor
REM observes the operation of the attached Token Ring by looking for hard errors and soft errors. It then reports these to LRM and aids in isolating the cause of the errors. It does the following during hard error detection:
REM monitors soft errors as follows:
LAN Reporting Mechanism
LRM controls the connection of LNM to the agents. LRM establishes reporting links between itself and each connected LNM. A reporting link is an LLC2 connection between LNM and LRM.
All communication between LNM and the agents is done via a reporting link. LRM passes management data to and from the appropriate agents to the reporting links. Up to four reporting links are supported. One is designated the controlling link and the other three are designated as observing links.
An LNM connected via the controlling link can perform all available operations. LNMs connected by observing links can perform only a limited subset of the available operations.
LNM Configuration Restrictions
The following restrictions apply to the LNM software:
Logical Link Class 2 Support
In LANs, the data link layer comprises two sublayers: the Medium Access Control (MAC) and the Link Layer Control (LLC). LLC provides two types of service:
LAN Network Manager (LNM) requires LLC2 connection-oriented services. LLC2 provides capabilities for the following:
The LLC sublayer conforms to the IEEE 802.5 standard.
Configuring LNM
This section summarizes the procedure necessary for basic configuration of the LNM feature.
- 1. Obtain the MAC address required for network manager software running on the Network Manager Station.
Enter list lnm ports at the Bridge> prompt.
Bridge>list lnm ports
Port Number [1]? 1
Port 1
LNM Agents Enabled: RPS CRS REM
Reporting Link State LNM Station Address
0 ACTIVE 10:00:5A:F1:02:37
1 AVAILABLE
2 AVAILABLE
3 AVAILABLE
MAC Addresses to use when configuring LNM Manager:
00:00:C9:08:35:47
40:00:D9:08:35:47
LNM not enabled on port 4
LNM not enabled on port 5
The Network Manager uses the MAC addresses displayed to configure it to the LNM agents present in the router.
Note:
Enter these addresses exactly as they appear in the output or LNM will not configure correctly.
- 2. Enable the LNM agents on the router.
Enter enable lnm at the LNM config> prompt to enable the LNM agents on the desired port.
LNM config>enable lnm
Port Number [1]? 1
The default setting has all LNM agents enabled.
- 3. Check the configuration by displaying enabled LNM agents.
Enter list port at the LNM config> prompt to display which LNM agents are enabled on your configured port.
LNM config>list port
Port Number [1]? 1
LNM Agents Enabled: RPS CRS REM
LNM Commands
This section describes the LNM configuration and monitoring commands.
Enter configuration commands at the LNM config> prompt. Display this prompt as follows:
Config>protocol bridge
Transparent Bridge user configuration
Bridge Config>lnm
LNM configuration
LNM config>
Enter monitoring commands at the LNM> prompt. Display this prompt as follows:
+protocol bridge
Bridge>lnm
LNM>
Table 1 lists the LNM commands. Not all parameters apply to all router platforms. Press Space after you type a command to display the available parameters for each command for your router. Enter help for information about using the command line interface.
Disable [C]
Disables all LNM agents on a port or disables specified LNM agents (CRS, REM, or RPS) on a port.
If the port is not configured then the message LNM not configured for Port XX is displayed. If this is the case, the command has no effect.
This command also disables the setting of the reporting link passwords from the remote LNM application linked to the bridge.
Syntax: disable
- crs (Configuration Report Server)
- rem (Ring Error Monitor)
- rps (Ring Parameter Server)
- lnm
- configuration-remote-change
crs port#
Disables the LNM agent CRS on the specified port.
Example: disable CRS
Port Number [1]? 3
rem port#
Disables the LNM agent REM on the specified port.
Example: disable REM
Port Number [1]? 3
Already Disabled
rps port#
Disables the LNM agent RPS on the specified port.
Example: disable RPS
Port Number [1]? 3
lnm port#
Disables LNM on the specified port. If the port is not configured, the message LNM not configured for Port XX appears and the command has no effect.
If none of the LNM agents are enabled for the specified port, the message LNM not configured for Port XX appears.
Example: disable lnm
Port Number [1]? 1
LNM not configured for Port 1
configuration-remote-change
Disables the setting of the reporting link passwords from the remote LNM application linked to the bridge. This command applies globally to all instances of LNM within the bridge.
Example: disable configuration-remote-change
CONFIGURATION-REMOTE-CHANGE: Disabled
Enable [C]
Enables all LNM agents on a specified port or enables specified LNM agents (CRS, REM, or RPS) on a specified port.
This command also enables the setting of the reporting link passwords from the remote LNM application linked to the bridge.
Syntax: enable
- crs (Configuration Report Server)
- rem (Ring Error Monitor)
- rps (Ring Parameter Server)
- lnm
- configuration-remote-change
crs port#
Enables the LNM agent CRS on the specified port.
Example: enable CRS
Port Number [1]? 10
Port number 10 does not exist
rem port#
Enables the LNM agent REM on the specified port.
Example: enable REM
Port Number [1]? 3
Already Enabled
rps port#
Enables the LNM agent RPS on the specified port.
Example: enable RPS
Port Number [1]? 1
Port number 1 is not Token Ring
lnm port#
Enables all LNM agents on the specified port.
If the port is not configured, the message Port number XX does not exist appears.
If the specified agent is already enabled for the port the message Already Enabled appears.
Example: enable lnm
Port Number [1]? 1
configuration-remote-change
Enables the setting of the reporting link passwords from the remote LNM application linked to the bridge. The default disables the setting of LNM configuration parameters remotely. This command applies globally to all instances of LNM within the bridge.
Example: enable configuration-remote-change
CONFIGURATION-REMOTE-CHANGE: Enabled
Exit [C] [M]
Use the exit command to return to the previous prompt.
Syntax: exit
Example: exit
List [C] [M]
Displays the LNM agents enabled for the specified port, and also displays passwords that have been configured for the bridge.
List [C]
Syntax: list
- password
- port
password
Displays the passwords that have been configured for the reporting links of the bridge. Displays whether or not the passwords may be changed by the remote LNM application.
Example: list password
Reporting Link Password
0 87654321
1 MADRAS
2 ABC1234
3 123ABC
CONFIGURATION-REMOTE-CHANGE: Disabled
port port#
Displays the LNM agents enabled for the specified port if the port is a Token Ring port supporting Source Routing Bridging.
Example: list port
Port Number [1]? 1
LNM Agents Enabled: RPS CRS REM
List [M]
Syntax: list
- bridge
- LNM ports
- source-routing configuration
bridge
Displays whether LNM is enabled on a specific port.
Example: list bridge
Bridge ID (prio/add): 32768/00-00-00-00-00-38
Bridge state: Enabled
UB-Encapsulation: Disabled
Bridge type: SR-TB
Bridge capability: ASRT
Number of ports: 5
STP Participation: IEEE802.1d on TB ports and IBM-8209 on SR ports
Maximum
Port Interface State MAC Address Modes MSDU Segment Flags
1 FDDI/0 Up AA-00-04-00-26-14 T 4491 RD
2 TKR/0 Up 00-00-93-90-4C-F7 T 2096 RD
3 TKR/1 Down 00-00-00-00-00-00 SR 0 223 RD,LE
4 FDDI/1 Down 00-00-00-00-00-00 T 0 RD
5 Eth/0 Down AA-00-04-00-26-14 0 RD
Flags:RE =IBMRT PC behaviour Enabled, RD = IBMRT PC behaviour Disabled
LE = LNM Enabled, LD = LNM Disabled, LF = LNM Failed
SR bridge number: 8
SR virtual segment: 812
Adaptive segment: 214
lnm ports
Displays the configuration of the LNM ports.
Example: list lnm ports
LNM not enabled on port 1
LNM not enabled on port 2
Port 3
LNM Agents Enabled: RPS CRS REM
Reporting Link State LNM Station Address
0 AVAILABLE
1 AVAILABLE
2 AVAILABLE
3 AVAILABLE
MAC Addresses to use when configuring LNM Manager:
00:00:00:00:00:00
00:00:00:00:00:00
LNM not enabled on port 4
LNM not enabled on port 5
source-routing configuration
Displays whether LNM is enabled on a specific port.
Example: list source-routing configuration
Bridge number: 8
Bridge state: Enabled
Maximum STE hop count 14
Maximum ARE hop count 14
Virtual segment: 812
Port Segment Interface State MTU STE Forwarding LNM
3 223 TKR/1 Enabled 4399 Auto ENA
- 214 Adaptive Enabled 1470 Yes
Set [C]
Sets the password for the specified reporting link number. The link number can be 0, 1, 2 or 3. Link 0 is used for the controlling link. Links 1, 2, and 3 are used for observing links.
The password should consist of six to eight characters, and must match the password used by LNM when it establishes a reporting link with the bridge. If you do not set the password, it defaults to the string 00000000.
Syntax: set password link# password
Example: set password
Link Number [0]? 1
Enter new password : [ABCDEFGH]? guesswho
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